Barely a week with a K2, 3-column theme, I had to agree with Sonny: the site was not looking good, at all. The other 3-column themes look blah, so after random searching, found out about Tarski, which claims to be lightweight, flexible, and widget-friendly. Loving it so far, especially the constants.php implementation/feature, which is great for ad placements, and ideal when upgrading to the latest theme version. If you have a php code to insert though, you have to do it the old-skool way (via sidebar.php, etc.). Commenting on the new design is encouraged 🙂
Related Post: Two or Three Columns?